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This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper has been withdrawn by the author due to crucial errors.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis. The consistent treatment is presented in the last publications of the author.

This paper has been withdrawn.

This paper has been withdrawn by the author due to errors and bad formalization.

The paper is withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn due to its publication

This paper has been withdrawn by the author because of copyright reasons.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author due to new results to be added.

Withdrawn; paper superceded by astro-ph/0105392

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors due to an incorrect analysis.

This paper has been withdrawn by the author.

This paper has been withdrawn because of serious errors.

This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027

This paper has been withdrawn by the author, due an error in claim 1.